Note Regarding 2012 Donations Prior to March 26 2012:
Inadvertently, I neglected to change my PayPal button, earlier this year, when I changed my e-mail address. As a result I suspect that several donations may have been returned to the folks who made them, with a notice that I had not yet signed up for a PayPal account. Ironically, one of the reasons I changed my e-mail address was that I got so many spam messages pretending to be from PayPal! Anyway, thanks to one vigilant supporter, I've caught the problem, and donations should work successfully now.
Please accept my apologies for the inconvenience.